Notes:Where possible, OGJ uses data from its surveys and
published official estimates. Most reserves estimates come from governments. Proved/proven oil reserves
- generally taken to be those quantities that geological and engineering
information indicates with reasonable certainty can be recovered in the future
from known reservoirs under existing economic and operating conditions.^OPEC member.

*Sudan and South Sudan (or officially the Republic
of South Sudan) – D.R.Most
of Sudan's oil is produced in the South, but the pipeline, refining and export
infrastructure is in the North of the country. The majority of reserves are
located in the oil-rich Muglad and Melut Basins. Oil produced in these basins
and nearby fields is transported through two main pipelines that stretch from
the landlocked South to Port Sudan. Sudan has three refineries located in
Khartoum, Port Sudan, and El-Obeid; with total refinery capacity just under
122,000 barrels per cal day---please see:EIA, Sudan and South
Sudan analysis, March 19, 2012. – D.R.

~Including other countries.

**OPEC has a total of 12 member
countries: Algeria, Angola, Ecuador, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar,
Saudi Arabia, the United Arab Emirates and Venezuela.